WO2005035839A1

WO2005035839A1 - Semiconductor single crystal manufacturing apparatus

Info

Publication number: WO2005035839A1
Application number: PCT/JP2004/015050
Authority: WO
Inventors: Toshirou Umeki
Original assignee: Komatsu Denshi Kinzoku Kabushiki Kaisha
Priority date: 2003-10-14
Filing date: 2004-10-13
Publication date: 2005-04-21
Also published as: TW200516179A; US20070051303A1; JP4362760B2; US7413609B2; DE112004001947T5; JP2005119891A; TWI261076B; DE112004001947B4

Abstract

A semiconductor single crystal manufacturing apparatus capable of lowering the local deterioration of a wire under high temperature atmosphere in the furnace of a chamber, wherein a crucible (24) in which silicone melt solution (28) is filled is installed in the furnace of the chamber (22), a pull-chamber (23) is disposed above the chamber (22), and a seed holder (32) lifting between the inside of the pull-chamber (23) and the inside of the furnace is suspended by a wire (50) through a connection member (31). A collar (52) is fitted to the wire (50) so that, when the seed holder (32) is positioned to touch the melt, the exposed portion of the wire (50) near the tip thereof becomes a specified temperature or below under the high temperature atmosphere in the furnace.

Description

Specification

Semiconductor single crystal manufacturing equipment

Technical field

The present invention relates to a semiconductor single crystal manufacturing apparatus for growing a semiconductor ingot (for example, a semiconductor single crystal such as single crystal silicon, and a compound semiconductor such as gallium arsenide).

Background art

Conventionally, a semiconductor single crystal such as high purity single crystal silicon or a compound semiconductor such as gallium arsenide is mainly used for a substrate of a semiconductor element. As one of the methods, the CZ method (Chyokralski method) is known, in which a cylindrical ingot is pulled from a raw material melt in a crucible.

In this CZ method, first, a crucible set in a chamber of a semiconductor ingot manufacturing apparatus is filled with a raw material as a raw material, and the raw material is heated and melted by a heater provided around the crucible. Then, the seed crystal attached to the seed holder is allowed to come into contact with the melt, and the seed holder is pulled up while rotating the seed holder and the crucible in the same direction or in the opposite direction, and a cylindrical ingot of a predetermined size is obtained. Grow up. Thereafter, the ingot is thinly sliced to manufacture silicon wafers used for semiconductor integrated circuits and the like (see, for example, Patent Document 1).

FIG. 6 shows an apparatus for producing a semiconductor ingot according to such a CZ method. FIG. 6 (A) is an explanatory view of a state in which the seed crystal attached to the seed holder is in contact with the melt, and FIG. 6 (B) is an explanatory view of a state in which the seed holder is pulled up to grow an ingot.

In FIG. 6, a semiconductor ingot manufacturing apparatus 1 includes a bottomed cylindrical chamber 2 and a cylindrical pull chamber 3 rising from the upper center of the chamber 2.

The furnace of the chamber 2 is provided with a crucible 4 made of quartz with a bottomed cylindrical shape opened upward, and a rotating shaft 7 whose upper end is fixed to the bottom of the crucible 4. The lower end of the rotation shaft 7 is connected to a drive source (not shown) outside the chamber 2 and supports the crucible 4 so as to be able to rotate in the chamber 2. A heater 5 for surrounding the crucible 4 is provided around the crucible 4 Furthermore, a heat insulating material 6 is provided around the heater 5 so as to surround the outer periphery and prevent radiation heat from the heater 5 from being directly radiated to the inner wall of the chamber 2.

At the top of the pull chamber 3, a wire trimming device 10 is provided. The seed holder 12 is attached to the tip of the wire 9 via the connecting member 11. The connecting member 11 has a hopper (not shown) suspended for replenishing the material serving as a raw material in the charging and recharging steps, and a seed holder mounted with a seed crystal in the pulling step of the ingot 13 12 is suspended. A gate valve 14 is provided at the lower side of the pull chamber 3 to isolate the interior of the pull chamber 3 vertically.

In such a configuration, the crucible 4 placed in the chamber 2 is filled with the material as the raw material, and then the material is heated and melted by the radiant heat of the heater 5 provided around the crucible 4 to melt the silicon melt 8 I assume. Thereafter, the seed crystal attached to the seed holder 12 is made to come into contact with the silicon melt 8, and the seed holder 12 and the crucible 4 are rotated in the same direction or in the opposite direction to each other to drive the strainer 10. The seed holder 12 is pulled up to grow the ingot 13.

Patent Document 1: Japanese Patent Application Laid-Open No. 8-261903

Disclosure of the invention

Problem that invention tries to solve

In general, tungsten 9 is often used mainly for the wire 9 used for pulling up the ingot, in consideration of the rotational fluctuation, heat resistance and the like of the seed crystal and the ingot 13. This tungsten starts to form acid when it reaches about 400 ° C in the reaction with air. In addition, tandasten has the property of forming a higher acid product W03 at 700 ° C. and rapidly acidifying.

On the other hand, the atmosphere for pulling up the semiconductor ingot is mostly occupied by the replacement gas which is an inert gas, and in addition, the oxide formed by the reaction between the silicon melt 8 and the quartz crucible 4 is It is present in trace amounts. As described above, since the atmosphere for pulling up the semiconductor ingot has an oxygen content which is absolutely smaller than that of air, the oxidation of the tantalum wire 9 hardly occurs at a temperature of about 400 ° C.

[0010] When the tungsten wire 9 is exposed to a high temperature of 700 The acid precipitate from the melt 8 reacts rapidly on the surface of the wire 9 to form a tungsten oxide precipitate.

[0011] In the semiconductor ingot manufacturing apparatus configured as described above, when the seed crystal is deposited in the silicon melt 8, ie, in the state shown in FIG. Although the inside of the furnace 2 differs depending on the volume etc., for example, about 900 ° C.-1000 ° C. in the area A immediately above the crucible 4 and about 700 ° C.-900 ° C. in the area B above it. Furthermore, in the upper area C, it is under about 700 ° C.! /, As in the case of multiple step temperature difference atmosphere.

In particular, the exposed portion in the furnace near connection member 11 of wire 9 is exposed to a relatively high temperature atmosphere of about 1000 ° C., so that radiant heat from heater 5 and acid from silicon melt 8 can be easily exposed. The surface is easily acidified by reaction with waste products. As a result, there is a local mechanical strength deterioration in the wire 9, and even though the mechanical strength in most of the wire 9 is sufficient, it is forced to replace the whole wire. There was a problem.

The invention according to the present application was made to solve the problems as described above, and the object of the invention is to reduce local deterioration of a wire under a high temperature atmosphere in a furnace of a chamber. It is an object of the present invention to provide a semiconductor single crystal manufacturing apparatus that can

Means to solve the problem

In order to achieve the above object, according to a first aspect of the present application, there is provided a chamber provided with a crucible filled with a melt in a furnace, a heater for heating the crucible, and a chamber provided in the chamber. A semiconductor single crystal manufacturing apparatus comprising: a wire; and a region covered with at least a high temperature of the wire covered with a collar.

[0015] A second invention according to the present application is the semiconductor single crystal manufacturing apparatus according to the first invention, characterized in that a plurality of the collars are provided.

[0016] Furthermore, according to a third invention of the present application, there is provided the semiconductor single body according to the first or second invention, characterized in that the collar is provided between a wire winding device and a seed crystal. It is a crystal manufacturing apparatus.

[0017] Further, according to a fourth invention of the present application, the collar is brought into proximity so as to cover the wire. It is a semiconductor single crystal production apparatus according to any one of the above-mentioned first to thirteenth inventions, which is provided.

Further, according to a fifth invention of the present application, there is provided a chamber provided with a crucible filled with a melt in a furnace, a pull chamber disposed above the chamber, the inside of the pull chamber, and the chamber A semiconductor single crystal manufacturing apparatus comprising: a seed holder that moves up and down between the two, and a wire that suspends the seed holder via a connecting member, wherein at least one of the seed holder and the connecting member When the seed crystal is attached to the holder and the seed crystal is at a position where it contacts the melt, the exposed portion in the vicinity of the tip of the wire has a length located in the range below a predetermined temperature under a high temperature atmosphere in the furnace. An apparatus for producing a semiconductor single crystal characterized by the above.

A sixth invention according to the present application is the semiconductor single crystal manufacturing apparatus according to the fifth invention, characterized in that “less than the predetermined temperature” is less than 700 ° C.

Effect of the invention

The apparatus for manufacturing a semiconductor single crystal according to the present invention includes a chamber provided with a crucible filled with a melt in a furnace, a heater for heating the crucible, and a wire provided in the chamber. Since the wire covers at least a region exposed to high temperature, the direct radiation heat to the wire and the reaction with the acid can be prevented, and the local deterioration of the wire can be reduced.

Furthermore, in the semiconductor single crystal manufacturing apparatus of the present invention, by providing a plurality of collars, processing accuracy is ensured in collar fabrication, and deformation due to a thermal effect at the time of pulling can be obtained. It is possible to suppress the influence of the eccentricity of the wire on its inherent crystal rotation. In addition, it becomes possible to adjust the wire exposure position by the temperature range and to control the wire oxidation speed.

Further, in the semiconductor single crystal manufacturing apparatus of the present invention, the length of at least one of the seed holder or the connecting member is set at a position where the seed crystal attached to the seed holder comes in contact with the melt. In some cases, the exposed portion near the tip of the wire has a length located within the range below a predetermined temperature in a high temperature atmosphere in the furnace, so that the wire is exposed even when the seed holder is in the landing position. In a position that avoids the high temperature atmosphere in the furnace of the chamber As a result, local deterioration of the wire can be reduced.

As described above, according to the present invention, when the seed holder is in the liquid contact position, the single crystal silicon wafer is exposed with the exposed portion near the tip of the wire maintained at a predetermined temperature or less under the high temperature atmosphere in the furnace. By growing the semiconductor device, it is possible to provide a highly durable semiconductor single crystal manufacturing apparatus.

Brief description of the drawings

FIG. 1 shows a first embodiment of a semiconductor ingot production apparatus according to the present invention, wherein (A) is an explanatory view of the semiconductor ingot production apparatus with the seed holder in the landing position, and (B) shows the seed holder It is explanatory drawing of the semiconductor ingot manufacturing apparatus of the state in the upper end position.

FIG. 2 shows Example 1 of the semiconductor ingot manufacturing apparatus of the present invention, in which (A) is a cross-sectional view of a wire and (B) is an enlarged cross-sectional view of a main part showing a relationship between a wire main body and a collar.

FIG. 3 is an enlarged cross-sectional view of the main parts showing Example 1 of the semiconductor ingot manufacturing apparatus of the present invention and showing the relationship between the wire main body and the connecting member.

[FIG. 4] Example 2 of the semiconductor ingot manufacturing apparatus of the present invention, wherein (A) is an explanatory view of the semiconductor ingot manufacturing apparatus with the seed holder in the landing position, (B) is the upper end position of the seed holder. It is explanatory drawing of the semiconductor ingot manufacturing apparatus of the state in FIG.

[FIG. 5] A third embodiment of the semiconductor ingot manufacturing apparatus of the present invention is shown, (A) is an explanatory view of the semiconductor ingot manufacturing apparatus with the seed holder in the landing position, (B) is the upper end position of the seed holder. It is explanatory drawing of the semiconductor ingot manufacturing apparatus of the state in FIG.

[Fig. 6] shows a conventional example of a semiconductor ingot manufacturing apparatus, wherein (A) is an explanatory view of the semiconductor ingot manufacturing apparatus in a state in which the seed holder is in the liquid contact position, (B) is a state in which the seed holder is in the upper end position. It is explanatory drawing of a semiconductor ingot manufacturing apparatus.

Explanation of sign

1 ... Semiconductor ingot manufacturing apparatus

2 ... chamber

3 · · Pull chamber

4 · · crucible 6 · · · insulation material

7 · · · rotational axis

8 ··· Silicon melt

9 ··· Wire

lO- "Retractor

ll-· · Connecting members

12 · · Seed Honoreda

13 ··· Ingot

14 ··· gate valve

21 · Semiconductor ingot manufacturing equipment

22 · “Channo

23 · "Pnore Channo

24 · · Crucible

25 · • seventa

26 · "Insulation material

27 · "Rotating axis

28 · · · Silicon melt

29 · "wire

30 · "Scissor

31 · · · Connecting member 31a ... insertion part

32 · · Seed Honoreda

33 ··· Ingot

34 ··· gate valve

35 · · Seal parts

36 · "rotation transmission parts

1 · · · Connection member

2 · · Seed Honoreda

50 · "wire 51 ··· Wire body

52 · · · color 52a ... convex part 52b ... concave part

53 · · · Connection

54 ... connection part 54a ... caulking part.

BEST MODE FOR CARRYING OUT THE INVENTION

Next, a semiconductor single crystal production apparatus of the present invention will be described based on the drawings.

Example 1

1 to 3 show a first embodiment of a semiconductor ingot production apparatus according to the present invention, and FIG. 1 (A) is an explanatory view of the semiconductor ingot production apparatus in a state where the seed holder is in the liquid contact position, (B) is an explanatory view of a semiconductor ingot manufacturing apparatus in which the seed holder is at the upper end position, FIG. 2 (A) is a sectional view of the wire, and FIG. 2 (B) is a main part showing the relationship between the wire body and the collar FIG. 3 is an enlarged cross-sectional view of the main part showing the relationship between the wire main body and the connecting member.

In FIG. 1, the semiconductor ingot manufacturing apparatus 21 includes a bottomed cylindrical chamber 22 and a cylindrical pull chamber 23 rising from the upper center of the chamber 22.

The furnace of the chamber 22 is provided with a crucible 24 made of quartz with a bottomed cylindrical shape opened upward, and a rotary shaft 27 whose upper end is fixed to the bottom of the crucible 24. The lower end of the rotating shaft 27 is connected to a drive source (not shown) outside the chamber 22 and supports the crucible 24 so as to be rotatable in the chamber 22 !. A heater 25 surrounding the crucible 24 is provided around the crucible 24, and the periphery of the heater 25 is surrounded to prevent radiation heat from the heater 25 from being directly radiated to the inner wall of the chamber 22. Thermal insulation 26 is provided.

On the other hand, at the upper part of the pull chamber 23, a wire removing device 30 is provided. A seed holder 32 is attached to the tip of the wire 29 via a connecting member 31. A hopper (not shown) for suspending the material to be used as a raw material is suspended at the connecting member 31 in the charging and recharging steps, and a seed holder on which a seed crystal is mounted in the pulling step of the ingot 33. 32 is suspended.

Further, a gate valve 34 for vertically isolating the inside of the pull chamber 23 is provided on the lower side of the pull chamber 23. Continuous airtightness in pull chamber 23 and chamber 22 Keeping the melt in the chamber 22 by closing the gate valve 34 except during the pulling of the force ingot 33 forming the space, the gas is sealed in the pull chamber 23 in that state to release the atmosphere. It is possible to take out the pulled ingot 33, attach the hopper and the seed crystal, and the like.

In the skimming device 30, the seed holder 32 attached to the tip of the wire 50 is placed between the landing position (the position shown in FIG. 1 (A)) and the upper end position (the position shown in FIG. 1 (B)). Move up and down. The liquid deposition position is the position when the seed crystal provided at the tip of the seed holder 32 reaches the liquid surface of the silicon melt 28, and the upper end position is the position where the grown ingot 33 has been pulled up completely.

The wire 50 includes a wire main body 51 and a plurality of collars 52 provided on the wire main body 51. The wire main body 51 is made of a strand (strand) into which a wire made of a material such as tungsten is twisted in consideration of rotational fluctuation and heat resistance of the seed crystal and the ingot 13.

Further, as shown in FIG. 2, at both ends of the wire main body 51, connecting portions 53, 54 to be connected to the wire taker 30 and the connecting member 31 by fitting of the ball joint method are respectively provided. There is. Thus, for example, as shown in FIG. 3, the connecting member 31 is formed with an insertion portion 3 la when the connecting portion 54 is fitted.

The connecting portion 54 is attached to the wire main body 51 by caulking a stainless steel crimped portion 54a. Since only the caulking portion 54 a contacts the connecting member 31 and the wire main body 51 does not directly contact the connecting member 31, wear of the wire main body 51 can be prevented. In addition, since the wire main body 51 is not exposed in the connecting member 31, the wire main body 51 is not exposed to the atmosphere gas which enters the connecting member 31 from the insertion portion 31a, and the oxidation consumption of the wire main body Can be prevented and the deterioration of the wire can be reduced.

The collar 52 is formed in a cylindrical shape of stainless steel, molybdenum, tungsten or the like, and as shown in FIG. 2 (B), the male and female males and females for closely connecting the upper and lower sides to each other at their ends. A convex portion 52a and a concave portion 52b as different engaging portions are formed. By thus providing different male and female engaging portions in the collar divided into a plurality, it is possible to prevent the generation of a gap between adjacent ones in the upper and lower directions, and the radiant heat of the collar also has a gap force. And oxide can be prevented. In the collar 52, the inner diameter D is larger than the diameter d of the wire main body 51. At this time, the difference between the inner diameter D and the diameter d is that the wire main body 51 is deteriorated with the passage of time, as in the case where the core (not shown) is cut or the wire is untwisted. Allow the 51 diameter to swell! /.

[0038] Thus, by making the inner diameter of the collar larger than the diameter of the wire, in the case of a wire with a core, the core wire becomes nearly broken even if there is no trauma on the side wires. In some cases, the diameter of the side wire increases within the inner diameter of the collar, and by moving the collar up and down, the frictional force can detect the bulge and prevent the wire from being broken.

For example, at the time of regular inspection or at the time of replacing the hopper with the seed crystal, the collar 52 is moved along the axis of the wire main body 51, and a swelling occurs in the wire main body 51! In this case, the movement of the collar 52 is performed smoothly, and the movement of the collar 52 is inhibited when the wire main body 51 is swollen, so that the deterioration of the wire main body 51 can be easily confirmed. Of course, it is needless to say that disconnection and deformation of the wire main body 51 can be visually confirmed because the collar 52 can move up and down.

Further, the outer diameter of the collar 52 is preferably such that it can pass through the space of the winding portion so that the collar does not become an obstacle even if the crystal length of the pulled ingot 33 becomes long.

In such a configuration, the wire 50 is lowered to drop the material into the crucible 24 in a state in which the hopper with the material to be the material loaded therein is mounted. After loading the material, the hopper is raised, and the pull chamber 23 is vertically isolated by the gate valve 34 (substantially, the furnace of the chamber 22 and the interior of the pull chamber 23 are isolated). In this state, gas can be sealed in the pull chamber 23 to open the air, and after the hopper is removed from the connecting member 31, the seed holder 32 with a seed crystal mounted anew is attached to the connecting member 31.

Thereafter, the gate valve 34 is opened to bring the seed crystal into contact with the surface of the silicon melt 28 of the crucible 24, and the crucible 24 is rotated (the wire 50 is simultaneously rotated in the same or reverse direction). Also take up the wire 50 with the wire cutter 30 and pull up the seed holder 32 Thus, a single crystal ingot 33 grows.

At this time, as shown in FIG. 1 (A), when the seed holder 32 is in the liquid contact position, the tip portion of the wire main body 51 is covered with the collar 52 within a certain range, It is possible to reduce the local deterioration of the wire 50 due to the radiation heat from the heater 24 and the reaction with the oxide from the silicon melt 28. More specifically, the tip of the wire main body 51 covered by the collar 52 when in the liquid contact position is made to be less than 700.degree.

Further, in a state where the seed holder 32 is in the liquid contact position, a portion where the wire main body 51 is exposed from the collar 52, in particular, a portion near the collar 52 and exposed from the collar 52 is a furnace Adjust the length of the collar 52 so that the force near the boundary between the area B and the area C at an internal temperature of around 700 ° C. is also located in the area C. More specifically, the length of the collar 52 is set so that the exposed portion of the wire main body 51 is less than 700 ° C. when in the liquid contact position.

As described above, the design of the device body is changed by setting the range of the wire main body 51 covered by the collar 52 to a range corresponding to the high temperature atmosphere taking into consideration the height of the chamber 22 in the furnace. Without using the existing connection member 31 and the seed holder 32, it is possible to reduce the deterioration caused by the oxidation of the wire main body 51.

In particular, by keeping the wire below 700 ° C., which is the temperature at which the reaction with the acid precipitate starts violently, the acid degradation of the wire can be delayed, and the local deterioration of the wire can be reduced.

[0047] The force described in the above embodiment for the wire used for pulling up the ingot. If it is the wire used in the chamber as well, the concept of the collar of the present invention is applicable in the same manner, The present invention is not limited to the pulling of ingots. Example 2

FIG. 4 shows Example 2 of the semiconductor ingot manufacturing apparatus of the present invention, in which (A) is an explanatory view of the semiconductor ingot manufacturing apparatus with the seed holder in the liquid contact position, and (B) shows the seed holder It is explanatory drawing of the semiconductor ingot manufacturing apparatus of the state in the upper end position.

The semiconductor ingot manufacturing apparatus 21 of the second embodiment shown in FIG. 4 is the same as the first embodiment described above in the connection member provided at the tip of the wire and the seed holder attached to the connection member. Since the only difference is, the other constituent members are assigned the same reference numerals as in FIG. 1 of the first embodiment and the description thereof is omitted. The seed holder 32 is also formed of carbon iso-power, and the exposed portion near the tip of the wire 29 when in the liquid contact position is above the inside of the furnace of the chamber 22, that is, at least in the high temperature atmosphere in the furnace. The length of the force near the boundary between area B and area C is also set to be located in area C. More specifically, the length is set such that the exposed portion of the wire 29 near the tip of the wire 29 is less than 700 ° C. when in the liquid contact position.

Further, in the case of the pull-up for recharging, the longest length of the seed honorore 32 is such that the lower end of the ingot 33 is positioned above the gate valve 34 when the ingot 33 is at the upper end position lifted. It is set. At this time, it is preferable that there is no design change of the pull chamber 23 (height change or enlargement of the diameter of the seal component 35 and the rotation transmission component 36).

In such a configuration, the wire 29 is lowered and the material is dropped into the crucible 24 in a state in which the hopper with the material to be the material loaded therein is mounted. After loading the material, the hopper is raised, and the pull chamber 23 is vertically isolated by the gate valve 34. After removing the hopper from the connecting member 31, the seed holder 32 with a seed crystal newly mounted is attached to the connecting member 31.

The material in the crucible 24 is melted by the heater 25, the gate valve 34 is opened, the wire 29 is lowered to the landing position, and the seed crystal is brought into contact with the surface of the silicon melt 28 of the crucible 24. The single crystal ingot 33 is grown by winding the wire 29 with the take-off device 30 while rotating the crucible 24 (the wire 29 may be simultaneously rotated in the same direction or in the opposite direction) and pulling up the seed holder 32. Do.

At this time, as shown in FIG. 4 (A), when the seed holder 32 is in the liquid contact position, the connection member 31 is exposed at the exposed portion of the wire near the tip of the wire 29, ie, near the connection member 31. Since the area near the boundary between area B and area C is also in area C, the radiant heat from silicon heater 25 and silicon melt 28 It is possible to reduce the local deterioration of the wire 29 due to the reaction with the oxide.

[0055] In particular, by positioning the exposed portion of the tip of the wire in an atmosphere below 700 ° C., which is a temperature at which the reaction with the acid precipitates starts violently in tungsten, the wire's oxidation is delayed, Local deterioration can be reduced.

Example 3 FIG. 5 shows a third embodiment of the semiconductor ingot manufacturing apparatus of the present invention, in which (A) is an explanatory view of the semiconductor ingot manufacturing apparatus with the seed holder in the liquid contact position, and (B) is a seed holder It is explanatory drawing of the semiconductor ingot manufacturing apparatus of the state in the upper end position.

The semiconductor ingot manufacturing apparatus 21 of the third embodiment shown in FIG. 5 is the same as the first embodiment described above in the connection member provided at the tip of the wire 29 and the seed holder attached to the connection member. The other components are denoted by the same reference numerals as in FIG. 1 of the first embodiment and the description thereof is omitted.

The connecting member 41 is detachably provided to the wire 29 and holds the seed holder 42 detachably. Further, in the connecting member 41, when the sheet holder 42 is in the liquid contact position, the tip of the wire 29 is in the furnace upper side of the chamber 22, that is, near the boundary between the area B and the area C at least under high temperature atmosphere in the furnace. The length is set so that the force is also located in area C. More specifically, the length is set such that the exposed portion of the wire 29 near the tip of the wire 29 is less than 700 ° C. when in the liquid contact position.

Further, the longest length of the connecting member 41 is set such that the lower end of the ingot 33 is positioned above the gate valve 34 when the ingot 33 is at the upper end position from which the ingot 33 is lifted. At this time, it is preferable to make no design change of the pull chamber 23 (height change and increase in diameter of the seal component 35 and the rotation transmission component 36).

Even in such a configuration, the gate valve 34 is opened, the seed crystal is brought into contact with the liquid surface of the silicon melt 28 of the crucible 24, and while rotating the crucible 24 (the wire 29 is directed in the same direction or in reverse). The single crystal ingot 33 is grown by winding the wire 29 with the wire cutter 30 and pulling up the seed holder 42.

At this time, as shown in FIG. 5 (A), when the seed holder 42 is in the liquid contact position, the connecting member 41 is exposed at the exposed portion of the wire near the tip of the wire 29, ie, near the connecting member 41. Since the area near the boundary between area B and area C is also in area C, the radiant heat from silicon heater 25 and silicon melt 28 It is possible to reduce the local deterioration of the wire 29 due to the reaction with the oxide.

[0062] In particular, by positioning the exposed portion of the wire tip in an atmosphere below 700 ° C., which is a temperature at which the reaction with the acid oxide starts violently in tungsten, the oxidation of the wire is delayed. And the local deterioration of the wire can be reduced.

In the second and third embodiments described above, the configuration disclosed in the first embodiment may be used in combination. Further, although the connecting members are used to connect the wire and the seed holder in the above-described first to third embodiments, in the present application, the connecting members are parts of the seed holder which are not necessarily separate from the seed holder. It also includes parts that play a role in bonding with wires.

Industrial applicability

[0064] Providing a collar in the region exposed to high temperature of the wire is not limited to the wire used for pulling up the ingot shown in the above-mentioned Example 1, and the wire for any purpose placed in the furnace. Can also be applied to

In addition, although the manufacture of a single crystal ingot is described as an example in the description of the first to third embodiments, the present invention is also applicable to a compound semiconductor ingot and other ingots in addition to the single crystal ingot. It is possible.

Claims

The scope of the claims

[1] A semiconductor single crystal manufacturing apparatus, comprising: a chamber provided with a crucible in which a melt is filled in a furnace; a heater for heating the crucible; and a wire provided in the chamber, at least the wire A semiconductor single crystal manufacturing apparatus characterized in that a region exposed to high temperature is covered with a collar.

[2] The apparatus for producing a semiconductor single crystal according to claim 1, wherein a plurality of the collars are provided.

[3] The apparatus for producing a semiconductor single crystal according to claim 1 or 2, wherein the collar is provided between a wire winding device and a seed crystal.

[4] The collar is provided close to the wire so as to cover the wire.

The semiconductor single crystal manufacturing apparatus according to any one of 3.

[5] A chamber provided with a crucible in which a melt is filled in a furnace, a pull chamber disposed above the chamber, a seed holder for moving up and down between the inside of the pull chamber and the chamber, and the seed holder What is claimed is: 1. A semiconductor single crystal manufacturing apparatus comprising: a wire suspended via a connection member;

When a seed crystal is attached to the seed holder and at least one of the length of the seed holder or the connection member is in a position where the seed crystal adheres to the melt, the exposed portion near the tip of the wire is the furnace A semiconductor single crystal manufacturing apparatus characterized in that the length is positioned within a range lower than a predetermined temperature under a high temperature atmosphere.

[6] The apparatus for producing a semiconductor single crystal according to claim 5, wherein “less than the predetermined temperature” is less than 700 ° C.